void Heap::collect(SweepToggle sweepToggle)
{
ASSERT(globalData()->identifierTable == wtfThreadData().currentIdentifierTable());
JAVASCRIPTCORE_GC_BEGIN();
markRoots();
m_handleHeap.finalizeWeakHandles();
m_globalData->smallStrings.finalizeSmallStrings();
JAVASCRIPTCORE_GC_MARKED();
resetAllocator();
#if ENABLE(JSC_ZOMBIES)
sweepToggle = DoSweep;
#endif
if (sweepToggle == DoSweep) {
sweep();
shrink();
}
// To avoid pathological GC churn in large heaps, we set the allocation high
// water mark to be proportional to the current size of the heap. The exact
// proportion is a bit arbitrary. A 2X multiplier gives a 1:1 (heap size :
// new bytes allocated) proportion, and seems to work well in benchmarks.
size_t proportionalBytes = 2 * size();
m_newSpace.setHighWaterMark(max(proportionalBytes, minBytesPerCycle));
JAVASCRIPTCORE_GC_END();
(*m_activityCallback)();
}
void WeakSet::sweep()
{
for (WeakBlock* block = m_blocks.head(); block; block = block->next())
block->sweep();
resetAllocator();
}
void Heap::collect(SweepToggle sweepToggle)
{
GCPHASE(Collect);
ASSERT(globalData()->identifierTable == wtfThreadData().currentIdentifierTable());
ASSERT(m_isSafeToCollect);
JAVASCRIPTCORE_GC_BEGIN();
#if ENABLE(GGC)
bool fullGC = sweepToggle == DoSweep;
if (!fullGC)
fullGC = (capacity() > 4 * m_lastFullGCSize);
#else
bool fullGC = true;
#endif
{
GCPHASE(Canonicalize);
canonicalizeCellLivenessData();
}
markRoots(fullGC);
{
GCPHASE(HarvestWeakReferences);
harvestWeakReferences();
m_handleHeap.finalizeWeakHandles();
m_globalData->smallStrings.finalizeSmallStrings();
}
JAVASCRIPTCORE_GC_MARKED();
{
GCPHASE(ResetAllocator);
resetAllocator();
}
if (sweepToggle == DoSweep) {
GCPHASE(Sweeping);
sweep();
shrink();
}
// To avoid pathological GC churn in large heaps, we set the allocation high
// water mark to be proportional to the current size of the heap. The exact
// proportion is a bit arbitrary. A 2X multiplier gives a 1:1 (heap size :
// new bytes allocated) proportion, and seems to work well in benchmarks.
size_t newSize = size();
size_t proportionalBytes = 2 * newSize;
if (fullGC) {
m_lastFullGCSize = newSize;
m_objectSpace.setHighWaterMark(max(proportionalBytes, m_minBytesPerCycle));
}
JAVASCRIPTCORE_GC_END();
(*m_activityCallback)();
}
void WeakSet::shrink()
{
WeakBlock* next;
for (WeakBlock* block = m_blocks.head(); block; block = next) {
next = block->next();
if (block->isEmpty())
removeAllocator(block);
}
resetAllocator();
if (m_blocks.isEmpty() && isOnList())
remove();
}
void WeakSet::sweep()
{
for (WeakBlock* block = m_blocks.head(); block;) {
heap()->sweepNextLogicallyEmptyWeakBlock();
WeakBlock* nextBlock = block->next();
block->sweep();
if (block->isLogicallyEmptyButNotFree()) {
// If this WeakBlock is logically empty, but still has Weaks pointing into it,
// we can't destroy it just yet. Detach it from the WeakSet and hand ownership
// to the Heap so we don't pin down the entire MarkedBlock or LargeAllocation.
m_blocks.remove(block);
heap()->addLogicallyEmptyWeakBlock(block);
block->disconnectContainer();
}
block = nextBlock;
}
resetAllocator();
}
